Dressing form



March 27 1934. E, J- ROE 1,952,779

DRESSING FORM Filed Jan. 13, 1932 Patented Mar. 27, 1934 UNITED STATES AT'ENT Claims.

My invention relates to improvements in dressing forms, for underrearner cutters.

In practice, it is common for the cutters of underreamers to become worn or cut-off during 5 the operation of drilling, making it necessary to dress the cutters, constantly, if the underreamer is to operate efficiently. The dressing of the cutters is done by the drillers at the well and at present the forms used to dress the cut ers are very unsatisfactory, frequently resulting in the cutter being rendered unfit for further service.

It is an object of my invention to provide a dressing form in which the cutter to be dressed may be firmly clamped, so it will not be deformed or broken during the process of dressing.

A further object of the invention is to provide a device of the above-mentioned character which is simple and durable in constructionn, reliable and efficient in use and inexpensive to manufacture.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing, forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a front elevation View of th dressing form,

Fig. 2 is a side elevation view of the same,

Fig. 3 is a vertical section taken on lines 3-3 of Fig. 1,

Fig. 4 is a top plan View, and, Fig. 5 is a horizontal section taken on lines 55 of Fig. 1.

In the drawing, wherein for the purpose of illustration, I have shown a preferred embodiment of my invention, the numeral 5, denotes a metal block formed integral with a base plate 6, and extending upwardly from the center thereof. The block is rectangular shape, in cross section, and the front of the block is provided with a vertical groove 7, opening through the top thereof, and formed integral with the sides of 5 the groove are opposed vertical ribs 8, providing guideways 9. The ribs 8 are formed approximately midway the depth of the groove 7, and engage the grooves 10 formed in the sides of the underreamer cutter 11, when the cutter is in- 5 serted in the guideways of the block. The cutter is inserted in the block in an inverted position, with the working face of the cutter turned outwardly and the groove 7 is of such length that the bottom end of the cutter projects slightly above the upper end of the block.

A clamping plate 12, extends transversely across the front of the block in covering relation to the groove, having its intermediate portion, curved outwardly, as at 13, to conform to the contour of the cutters outer face. A boss 14 projects from the inner face of the plate 12 and is adapted to fit in the round hole 15, in the outer face of the cutter to prevent deforming of the hole while dressing the cutter. The upper end of the plate 12 terminates about one inch from the top of the block, so that the only exposed part of the cutter is the bottom end of the cutter where the dressing or swaging takes place and the lower end of the working face which is to be expanded. The bottom of the groove 7, is bevelled, as a It, and projecting upwardly and outwardly rom the front of the block 5, at the base of the groove is a ledge 15, upon which the clamping plate 12 is adapted to rest, the intermediate portion of the ledge being bowed outwardly, and its upper edge longitudinally curved to provide a recess to receive the lower edge of the clamping plate. The clamping plate 12 is fastened to the block by eye bolts 16, the eyes of the bolts being pivotally mounted between the spaced ears 17, extending laterally from the sides of the block 5, by pivot pins 18, permitting the bolts to swing on a horizontal plane. When swung forwardly, the bolts engage the bifurcations 19 in the ends of the arms 20, extending laterally from the sides of the plate 12. Wing nuts 21 are threaded on the free ends of the bolts and upon tightening of the nuts the clamping plate is drawn into tight engagement with the cutter, thus holding the cutter firmly within the block during the dressing operation.

In use, the cutter to be dressed is first heated to the desired temperature, and then dropped into the guideways 9 of the block 5, in an inverted position. The clamping plate 12 is then applied to the front of the block with the boss 14 disposed in the opening 15 of the cutter, and the bolts 16 swung into engagement with the arms 20. Upon tightening the wing nuts 21 on the bolts 16, the clamping plate 12 is drawn into tight engagement with the cutter firmly holding the cutter in the block, so it will not become deformed or broken during the dressing operation.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that certain changes in the shape, size and arrangement of the parts may be made without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:--

1. A device of the character described comprising a block having a vertical groove adapted to receive a cutter to be dressed, a clamping plate disposed over said groove for securing the cutter in said block, and a boss projecting from said plate adapted to engage an opening in the cutter.

2. A device of the character described comprising a block having a vertical groove adapted to receive a'cut'ter to be dressed, a clamping plate disposed over said groove, a boss extending from said plate adapted to engage an opening in the cutter, and means for clamping said plate in tight engagement with the cutter.

3. A device of the character described comprising a block having a vertical groove adapted to receive a cutter to be dressed, guideways formed in the sides of said groove adapted to slidably engage with the guideways formed in the cutter, a clamping plate disposed over said groove, a boss extending from said plate adapted to engage Bin/opening in the cutter, and bolts extending from said block having engagement with said plate for securing said plate in tight engagement with the cutter.

4. A dressing form for underreamer cutters comprising a block having a vertical groove in its front wall closed at its lower end, the bottom of the groove being inclined upwardly and forwardly and terminating in a ledge extending transversely of said block across the front of the groove, the upper edge of the ledge being curved longitudinally to provide a recess, and a clamping plate extending across the groove having its lower edge curved to fit in the recess of the ledge.

5. A dressing form for Lmderreamer cutters comprising a block having a vertical groove in its front wall, closed at its lower end, a ledge extending transversely across the lower end of said block and groove, the upper edge of said ledge having a recess formed therein, and a clamping plate extending across the groove having its lower edge seated in the recess of the ledge.

EMMETT J. ROE. 

